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We should first know the 1st,2nd,3rd laws of logarithm
formulas of logarithm
by leaning those we can easily solve sums of logarithm
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1.first look for how many numbers before decimal.here,no number.so first (total number of digits before decimal - 1) so here, -1 is the first digit of answer.

2.look for 17 row and 1 column.here value is 2330.

3.then look for 4 column(the next column) 17 row .here, 10

add the steps 2 and 3 = 2340

add -1 (step 1) and step 4
ans = -1.2340 

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